Micronutrient Deficiencies — MCQs
A 45-year-old patient presents with symptoms of anemia, depigmented hair, and myelopathy. Which of the following mineral deficiencies is most likely associated with this clinical presentation?
A child was brought with pedal edema and cheilosis. Cardiomegaly was present. What is the vitamin deficiency associated with this clinical presentation?
Acrodermatitis enteropathica is seen with deficiency of?
Methyl-tetrahydrofolate (5-methyl-THF) gets accumulated in deficiency of which of the following?
Acrodermatitis enteropathica is:-
Which of the following clinical signs is most indicative of vitamin A deficiency in a community?
A child of 8 kg has Bitot's spots in both eyes. Which of the following is the most appropriate schedule to prescribe vitamin A to this child?
Which of the following are characteristic laboratory findings in Iron Deficiency Anemia (IDA)? 1. Low serum ferritin 2. Low transferrin saturation 3. Low serum iron 4. Increased TIBC
As per the Government of India guidelines, the daily dose of elemental iron recommended for prophylaxis during pregnancy is
Lowering of which of the following parameters indicates acute malnutrition?
Micronutrient Deficiencies Indian Medical PG Practice Questions and MCQs
Question 1: A 45-year-old patient presents with symptoms of anemia, depigmented hair, and myelopathy. Which of the following mineral deficiencies is most likely associated with this clinical presentation?
- A. Copper (Correct Answer)
- B. Iron
- C. Fluoride
- D. Zinc
- E. Selenium
Explanation: ***Copper*** - **Copper deficiency** can lead to anemia due to its role in iron metabolism, **depigmented hair** (achromotrichia) due to impaired melanin synthesis, and **myelopathy** due to its involvement in maintaining the myelin sheath. - Symptoms often mimic those of **vitamin B12 deficiency**, including neurological manifestations like ataxia and spasticity. *Iron* - **Iron deficiency** is the most common cause of anemia but does not typically cause **depigmented hair** or **myelopathy**. - Its neurological symptoms are usually limited to **restless legs syndrome** and **pica**, not demyelination. *Fluoride* - **Fluoride deficiency** is primarily associated with an increased risk of dental caries and does not cause anemia, hair depigmentation, or myelopathy. - Excessive intake (fluorosis) can lead to **bone and tooth abnormalities**. *Zinc* - **Zinc deficiency** can cause immune dysfunction, **dermatitis**, impaired wound healing, and growth retardation. - It may rarely cause anemia in severe cases but does not typically cause hair depigmentation or myelopathy as primary symptoms. *Selenium* - **Selenium deficiency** is associated with **Keshan disease** (cardiomyopathy) and **Kashin-Beck disease** (osteoarthropathy). - While it can cause muscle weakness and fatigue, it does not typically present with the specific triad of anemia, hair depigmentation, and myelopathy seen in copper deficiency.
Question 2: A child was brought with pedal edema and cheilosis. Cardiomegaly was present. What is the vitamin deficiency associated with this clinical presentation?
- A. Riboflavin deficiency
- B. Thiamine deficiency (Correct Answer)
- C. Pyridoxine deficiency
- D. Niacin deficiency
Explanation: ***Thiamine deficiency*** - The combination of **pedal edema** and **cardiomegaly** suggests **wet beriberi**, which is caused by **thiamine (vitamin B1) deficiency**. - **Cheilosis** (cracking at the corners of the mouth) is also a feature that can be seen in various vitamin deficiencies, but the cardiac involvement is highly indicative of thiamine deficiency. *Riboflavin deficiency* - **Riboflavin (vitamin B2) deficiency** is characterized by **cheilosis**, glossitis, angular stomatitis, and seborrheic dermatitis. - It typically does not cause **cardiomegaly** or significant **pedal edema** without other concurrent nutritional deficiencies. *Pyridoxine deficiency* - **Pyridoxine (vitamin B6) deficiency** primarily manifests as **dermatitis**, **microcytic anemia**, and neurological symptoms like **peripheral neuropathy** and **seizures**. - It is not typically associated with **pedal edema** or **cardiomegaly**. *Niacin deficiency* - **Niacin (vitamin B3) deficiency** causes **pellagra**, characterized by the "3 Ds": **dermatitis**, **diarrhea**, and **dementia**. - While it can manifest with systemic issues, it does not typically present with the prominent **cardiomegaly** and **pedal edema** seen in this case.
Question 3: Acrodermatitis enteropathica is seen with deficiency of?
- A. Zinc (Correct Answer)
- B. Copper
- C. Vitamin A
- D. Iron
Explanation: ***Zinc*** - **Acrodermatitis enteropathica** is a rare, inherited disorder characterized by a triad of **dermatitis**, **diarrhea**, and **alopecia**, primarily due to impaired zinc absorption. - **Zinc supplementation** is the cornerstone of treatment and typically leads to rapid resolution of symptoms. *Copper* - Copper deficiency can lead to **anemia**, **neutropenia**, and **neurological symptoms** like ataxia and peripheral neuropathy. - It does not cause the characteristic skin lesions of acrodermatitis enteropathica. *Vitamin A* - Vitamin A deficiency is associated with **xerophthalmia** (dry eyes), **night blindness**, and impaired immune function. - It does not present with acrodermatitis enteropathica. *Iron* - Iron deficiency causes **microcytic hypochromic anemia**, fatigue, and pica. - It does not manifest as the specific dermatological and gastrointestinal symptoms seen in acrodermatitis enteropathica.
Question 4: Methyl-tetrahydrofolate (5-methyl-THF) gets accumulated in deficiency of which of the following?
- A. Vitamin B12 (Cobalamin) (Correct Answer)
- B. Vitamin B2 (Riboflavin)
- C. Vitamin B1 (Thiamine)
- D. Vitamin B6 (Pyridoxine)
Explanation: ***Vitamin B12 (Cobalamin)*** - A deficiency in **Vitamin B12** (cobalamin) leads to the accumulation of **5-methyl-tetrahydrofolate (5-methyl-THF)** due to the **"folate trap"** hypothesis. - This occurs because B12 is a cofactor for **methionine synthase**, which converts 5-methyl-THF back to tetrahydrofolate (THF), a necessary step for DNA synthesis and other one-carbon metabolism reactions. - Without B12, folate remains trapped in the methyl form and cannot be utilized for other essential reactions. *Vitamin B2 (Riboflavin)* - **Vitamin B2** (riboflavin) is a precursor for **FAD** and **FMN**, essential coenzymes in various redox reactions in the electron transport chain and other metabolic pathways. - Its deficiency typically presents as **cheilosis**, glossitis, and angular stomatitis, but does not cause methyl-THF accumulation. *Vitamin B1 (Thiamine)* - **Vitamin B1** (thiamine) is a cofactor for enzymes like **pyruvate dehydrogenase** and **alpha-ketoglutarate dehydrogenase** in carbohydrate metabolism. - Its deficiency causes **Beriberi** (wet, dry, or Wernicke-Korsakoff syndrome), affecting the cardiovascular and nervous systems, but does not affect folate metabolism. *Vitamin B6 (Pyridoxine)* - **Vitamin B6** (pyridoxine) is a coenzyme for many metabolic reactions, particularly in amino acid metabolism and neurotransmitter synthesis. - Deficiency can lead to **sideroblastic anemia**, neurological symptoms, and dermatitis, but does not cause methyl-THF accumulation.
Question 5: Acrodermatitis enteropathica is:-
- A. Inherited disorder of impaired uptake of zinc from body (Correct Answer)
- B. Inherited disorder of excessive excretion of zinc from body
- C. Inherited disorder of excessive excretion of copper from body
- D. Inherited disorder of impaired uptake of copper from body
- E. Inherited disorder of impaired excretion of zinc from body
Explanation: ***Inherited disorder of impaired uptake of zinc from body*** - **Acrodermatitis enteropathica** is an **autosomal recessive** genetic disorder characterized by a mutation in the **SLC39A4 gene**, which encodes a zinc transporter protein (ZIP4). - This mutation leads to **impaired absorption of dietary zinc** in the intestine, resulting in severe **zinc deficiency**. - Clinical features include **periorificial and acral dermatitis**, **diarrhea**, and **alopecia** that respond to zinc supplementation. *Inherited disorder of excessive excretion of zinc from body* - This statement is incorrect as Acrodermatitis enteropathica is due to **impaired uptake**, not excessive excretion of zinc. - Excessive excretion of zinc is not the mechanism responsible for the primary deficiency seen in this condition. *Inherited disorder of excessive excretion of copper from body* - This describes conditions like **Wilson's disease**, which involves copper accumulation due to impaired biliary excretion, not zinc deficiency. - Acrodermatitis enteropathica specifically relates to **zinc metabolism**, not copper. *Inherited disorder of impaired uptake of copper from body* - This describes conditions like **Menkes disease**, a rare X-linked recessive disorder characterized by a defect in copper transport and absorption, leading to copper deficiency. - Acrodermatitis enteropathica is distinctly a **zinc metabolism disorder**. *Inherited disorder of impaired excretion of zinc from body* - This would imply zinc accumulation rather than deficiency, which is not the pathophysiology of Acrodermatitis enteropathica. - The condition is characterized by **zinc deficiency due to malabsorption**, not problems with zinc excretion.
Question 6: Which of the following clinical signs is most indicative of vitamin A deficiency in a community?
- A. Corneal ulcer prevalence of 0.1%
- B. Conjunctival xerosis prevalence of 0.2%
- C. Bitot spots prevalence of 0.5%
- D. Night blindness prevalence of 10% (Correct Answer)
Explanation: ***Night blindness prevalence of 10%*** - **Night blindness** is the earliest and most common clinical sign of **vitamin A deficiency** (WHO classification X1A/X1B). - A prevalence of **10%** indicates a **severe public health problem** according to WHO criteria (>1% is considered a public health problem). - It affects a large proportion of the population and is the most sensitive indicator for community-level assessment. *Corneal ulcer prevalence of 0.1%* - **Corneal ulcers** (keratomalacia) are a severe, sight-threatening manifestation of **vitamin A deficiency** representing late-stage disease (WHO classification X3). - While serious and requiring urgent intervention, a prevalence of 0.1% indicates fewer affected individuals compared to night blindness. *Conjunctival xerosis prevalence of 0.2%* - **Conjunctival xerosis** is a clinical sign of vitamin A deficiency characterized by dryness of the conjunctiva (WHO classification X1A). - A prevalence of 0.2% is relatively low compared to night blindness, making it less indicative of widespread community-level deficiency. *Bitot spots prevalence of 0.5%* - **Bitot spots** are a specific sign of **vitamin A deficiency**, characterized by foamy, dry patches on the conjunctiva (WHO classification X1B). - A prevalence of 0.5% is higher than other severe signs but still less indicative of widespread deficiency than night blindness.
Question 7: A child of 8 kg has Bitot's spots in both eyes. Which of the following is the most appropriate schedule to prescribe vitamin A to this child?
- A. 2 lakh units orally on day 0, 14
- B. 2 lakh units orally on day 0, 1, 14 (Correct Answer)
- C. 1 lakh units orally on day 0, 14
- D. 1 lakh units orally on day 0, 1, 14
Explanation: ***2 lakh units orally on day 0, 1, 14*** - For a child weighing **8 kg** with **Bitot's spots (WHO classification X1B)**, the therapeutic dose is **200,000 IU** (2 lakh units) of vitamin A. - The standard WHO/IAP schedule for treating **vitamin A deficiency with ocular signs** is administration on **Day 0, Day 1, and Day 14** to rapidly replete stores and prevent progression. - The **oral route** is preferred for **Bitot's spots without corneal ulceration**, as it is effective, safe, and well-tolerated. - **IM route** is reserved for severe xerophthalmia (X2/X3 with corneal ulceration), persistent vomiting, or inability to take oral medications. *2 lakh units orally on day 0, 14* - Although the individual dose of **200,000 IU** is correct for this 8 kg child with **Bitot's spots**, this schedule misses the critical **Day 1 dose**. - The missing dose on Day 1 delays rapid **vitamin A replenishment**, which is crucial for preventing progression of **ocular damage** and achieving adequate tissue stores. *1 lakh units orally on day 0, 14* - This dose of **100,000 IU** is inadequate for a child weighing **8 kg or more** with clinical **vitamin A deficiency**. - WHO guidelines recommend **100,000 IU for children <8 kg** and **200,000 IU for children ≥8 kg**, making this dosage insufficient. - Additionally, the schedule is incomplete as it misses the **Day 1 dose**. *1 lakh units orally on day 0, 1, 14* - While the schedule of Day 0, Day 1, and Day 14 is appropriate, the **dose of 100,000 IU is inadequate** for a child weighing **8 kg**. - This lower dose may not provide sufficient **vitamin A replenishment** to reverse **Bitot's spots** and prevent progression to more severe xerophthalmia.
Question 8: Which of the following are characteristic laboratory findings in Iron Deficiency Anemia (IDA)? 1. Low serum ferritin 2. Low transferrin saturation 3. Low serum iron 4. Increased TIBC
- A. 3 and 4 only
- B. 1, 3, and 4 only
- C. 1 and 2 only
- D. All of the above (Correct Answer)
Explanation: ***All of the above (1, 2, 3, and 4)*** - **All listed parameters are characteristic findings in Iron Deficiency Anemia (IDA):** - **Low serum ferritin** - Indicates depleted iron stores; most specific early marker [1] - **Low serum iron** - Reflects reduced circulating iron availability [1] - **Low transferrin saturation** - Shows decreased percentage of iron-bound transferrin molecules (typically <15%) [1] - **Increased TIBC** - Compensatory increase in total iron-binding capacity as the liver produces more transferrin to capture available iron [1] *Why not just 1, 2, and 3?* - Increased TIBC is also a hallmark finding in IDA, distinguishing it from anemia of chronic disease (where TIBC is typically low) [1] *Why not just 3 and 4?* - Serum ferritin and transferrin saturation are equally important diagnostic parameters [1] *Why not just 1, 3, and 4?* - Low transferrin saturation is a key diagnostic criterion for IDA [1] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 657-660.
Question 9: As per the Government of India guidelines, the daily dose of elemental iron recommended for prophylaxis during pregnancy is
- A. 150 mg/day for 100 days
- B. 200 mg/day for 100 days
- C. 100 mg/day for 100 days (Correct Answer)
- D. 50 mg/day for 100 days
Explanation: ***100 mg/day for 100 days*** - As per the **Government of India guidelines**, the recommended daily dose of **elemental iron** for prophylaxis during pregnancy is 100 mg/day. - This dose is typically continued for at least **100 days** to ensure adequate iron stores and prevent iron deficiency anemia. *150 mg/day for 100 days* - This dose exceeds the **recommended daily prophylactic** amount of elemental iron specified by Indian government guidelines. - While higher doses may be used for **therapeutic treatment** of existing iron deficiency anemia, it is not the standard for prophylaxis. *200 mg/day for 100 days* - This amount is significantly higher than the standard **prophylactic recommendation** for elemental iron during pregnancy in India. - Such a high dose would typically only be prescribed for **treating severe anemia**, not for routine prevention. *50 mg/day for 100 days* - This dose is lower than the **recommended daily amount** for effective iron prophylaxis according to the Government of India guidelines. - Such a dose might be **insufficient** to maintain adequate iron levels and prevent anemia during pregnancy.
Question 10: Lowering of which of the following parameters indicates acute malnutrition?
- A. Weight for age
- B. Weight for height (Correct Answer)
- C. Height for age
- D. Body Mass Index (BMI)
Explanation: **Explanation:** In pediatric nutritional assessment, different anthropometric indices reflect different durations and types of nutritional stress. **1. Why "Weight for Height" is correct:** **Weight for height** is the primary indicator of **acute malnutrition** (also known as **Wasting**). Weight is a sensitive parameter that fluctuates rapidly in response to recent nutritional deficiencies or acute illnesses (like diarrhea or respiratory infections). When a child’s weight is low relative to their height, it signifies a recent and severe process of weight loss, indicating an acute nutritional emergency. **2. Analysis of Incorrect Options:** * **Weight for Age (Underweight):** This is a composite indicator that reflects both acute and chronic malnutrition. It does not distinguish between a child who is short (stunted) and a child who is thin (wasted). * **Height for Age (Stunting):** This indicates **chronic malnutrition**. Linear growth retardation occurs over a long period due to persistent nutritional deprivation or recurrent infections. It represents "past" or long-term nutritional status. * **Body Mass Index (BMI):** While used in adults and older children, in the context of standard WHO pediatric growth monitoring for acute malnutrition, "Weight for Height" is the specific gold-standard parameter used to define wasting. **Clinical Pearls for NEET-PG:** * **Wasting (Acute):** Weight for Height < -2 SD. * **Stunting (Chronic):** Height for Age < -2 SD. * **Underweight (Composite):** Weight for Age < -2 SD. * **Mid-Upper Arm Circumference (MUAC):** A MUAC < 11.5 cm is a quick screening tool for Severe Acute Malnutrition (SAM) in children aged 6–59 months. * **Gomez Classification:** Based on Weight for Age. * **Waterlow’s Classification:** Uses Weight for Height (Wasting) and Height for Age (Stunting).
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